[mark.carline]

Calling owners of the 100mm Macro USM...

Does anyone elses back lense (the one inside closest to the camera body) move *very* slightly ?

I know this part of the lense moves when you focus so this might be totally normal for this lense (I have seen lots of Canon focus elements move slightly).

Can somebody here check their version of your lense to see if yours does the same ?

[mark.carline]

:BUMP: I took it back for them to check it out. have to wait and see what they say.